Exterior · definition
A drained, vented air gap between siding and the WRB that lets the wall dry and dramatically extends cladding life. Best practice for premium installs.
Source: Building Science Corporation — BSI-038: Mind the Gap, Eh?
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.